Metal finishing Q&As since 1989

-----

Chrome Plating Baking Process

We are having steel Grade 8 Hex Head bolts plated with decorative chrome. I am concerned about the strength of the bolts (hydrogen embrittlement) since the platers did not begin the baking process until 48 hours after the chrome was applied. Could this delay cause damage or lasting effects or is it unimportant?

Thank you.

Curt Fisher
Steel fabrication, fasteners distribution - Wallingford, Connecticut, USA
2004

---

It can have catastrophic effect.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

You were kind enough to answer my letter. Could you please tell me what is the most commonly cited spec for the application (having steel Grade 8 Hex Head bolts plated with decorative chrome). And does it specifically address the time frame limits (how soon after plating) for baking or quenching? Thank you for your help.

Curt Fisher
Steel fabrication, fastener distribution - Wallingford, Connecticut, USA
2004

The time frame in spec's is usually within the hour. In grade 8 fasteners you should maintain this time limit, since the hardness of this fasteners could make them even more vulnerable.

Carlos Cielak
plating shop - Mexico City, DF, Mexico
2004

---

The Spec you are looking for is FED QQ-C-320 type I.

Rodney Nichols
- Bridgeport, Connecticut
2004